EP 1371672 B1 20110413 - PROCESS FOR PRODUCING SPHERICAL COMPOUND HARDENED MELAMINE RESIN PARTICLES
Title (en)
PROCESS FOR PRODUCING SPHERICAL COMPOUND HARDENED MELAMINE RESIN PARTICLES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON KUGELFÖRMIGEN VERBUNDTEILCHEN MIT GEHÄRTETEM MELAMINHARZ
Title (fr)
PROCEDE DE PRODUCTION DE PARTICULES COMPOSITES SPHERIQUES DURCIES DE MELAMINE
Publication
Application
Priority
- JP 0201633 W 20020222
- JP 2001057589 A 20010302
Abstract (en)
[origin: EP1371672A1] The present invention relates to a process for producing spherical composite cured melamine resin particles excellent in water resistance, in which colloidal silica is localized near the surface thereof, wherein the process makes possible to control particle size thereof in broad ranges from a submicron to micron order. Concretely, the present invention is a process for producing spherical composite cured melamine resin particles comprising (a) a step of reacting a melamine compound with an aldehyde compound in an aqueous medium under a basic condition in the presence of a suspension of colloidal silica having an average particle size of 5 to 70 nm to produce an aqueous solution of a precondensate of water-soluble melamine resin; and (b) a step of adding an acid catalyst to the aqueous solution produced in the step (a) to separate out spherical composite cured melamine resin particles, and further (c) a step of coating the surface of the spherical composite cured melamine resin particles with inorganic compound particles.
IPC 8 full level
C08G 12/32 (2006.01); C08K 3/36 (2006.01); C08J 3/12 (2006.01); C08J 3/26 (2006.01); C08J 9/00 (2006.01); C08L 61/28 (2006.01)
CPC (source: EP KR US)
C08G 12/32 (2013.01 - EP KR US); C08J 3/128 (2013.01 - EP US); C08J 3/26 (2013.01 - EP US); C08J 9/0004 (2013.01 - EP US); C08L 61/28 (2013.01 - EP US); C08J 2300/14 (2013.01 - EP US); C08J 2361/28 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1371672 A1 20031217; EP 1371672 A4 20051116; EP 1371672 B1 20110413; AT E505496 T1 20110415; DE 60239733 D1 20110526; JP 2002327036 A 20021115; JP 3903809 B2 20070411; KR 100735993 B1 20070706; KR 20030081483 A 20031017; TW 593387 B 20040621; US 2004010114 A1 20040115; US 7115303 B2 20061003; WO 02070576 A1 20020912
DOCDB simple family (application)
EP 02700726 A 20020222; AT 02700726 T 20020222; DE 60239733 T 20020222; JP 0201633 W 20020222; JP 2002045613 A 20020222; KR 20037011496 A 20030901; TW 91103462 A 20020226; US 61696503 A 20030711